6277

6277 PRELIMINARY INFORMATION (Subject to change without notice) July 20, 2000 Data Sheet 26185.202 8-BIT SERIAL-INPUT, CONSTANTCURRENT LATCHED LED DRIVER The A6277x is specifically designed for LED-display applications. Each BiCMOS device includes an 8-bit CMOS shift register, accompanying data latches, and eight npn constant-current sink drivers. Two package styles and two operating temperature ranges are available. The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 5 V logic supply, typical serial data-input rates are up to 20 MHz. The LED drive current is determined by the user’s selection of a single resistor. A CMOS serial data output permits cascade connections in applications requiring additional drive lines. For inter-digit blanking, all output drivers can be disabled with an ENABLE input high. In addition, a HIGH/LOW function enables full selected current with the application of a logic low, or 50% selected current with the application of a logic high. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix ‘S–’ is -20°C to +85°C. Two package styles are provided for through-hole DIP (suffix ‘–A’) or surface-mount SOIC (suffix ‘–LW’) applications. The copper lead frame and low logic-power dissipation allow the dual in-line package to sink 122 mA through all outputs continuously over the operating temperature range (1.0 V drop, +8...